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並前往https://www.johndcook.com/blog/2018/04/10/up-arrow-and-down-arrow-notation/

Knuth's up arrow and down arrow notations - John D. Cook

One up arrow denotes repeated multiplication, i.e. exponentiation. b \uparrow n &=& \underbrace{b \cdot b \cdot. Two up arrows denote repeated ...

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